EcoSip is aiming to revamp the green building industry with their prefab outer walls. The plywood comes from sustainably farmed, fast-growing trees.
The wood is laminated, the panels are filled with foam, then the light-weight boards are hauled to the construction site. These advancements contribute to a dramatically reduced subcontractor cost and building time is dramatically reduced. In fact, the company claims the entire outer shell of a house can be constructed in a single day.
For a little more on the prefab movement, check these out: